:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --bg3: #1a1a25;
  --text: #e8e8f0;
  --text2: #a0a0b8;
  --text3: #6a6a80;
  --accent: #7c3aed;
  --accent2: #6d28d9;
  --accent-glow: rgba(124,58,237,0.15);
  --purple: #a78bfa;
  --blue: #38bdf8;
  --pink: #f472b6;
  --green: #34d399;
  --red: #f87171;
  --yellow: #fbbf24;
  --border: #1e1e2e;
  --radius: 12px;
  --gold: #fbbf24;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--purple); }

/* Header */
.header {
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 18px; color: var(--text);
}
.logo-icon { font-size: 24px; }
.nav { display: flex; gap: 24px; align-items: center; }
.nav a { color: var(--text2); font-size: 14px; font-weight: 500; }
.nav a:hover { color: var(--text); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
}
.hero h1 {
  font-size: 48px; font-weight: 800;
  background: linear-gradient(135deg, #7c3aed, #38bdf8, #f472b6);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 20px; color: var(--text2); margin-bottom: 24px;
}
.trust-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(124,58,237,0.1); color: var(--purple);
  padding: 8px 20px; border-radius: 999px; font-size: 14px; font-weight: 500;
  border: 1px solid rgba(124,58,237,0.2);
}
.badge-icon { font-size: 16px; }

/* Tools Grid */
.tools-section { padding: 60px 0; }
.tools-section h2 { font-size: 28px; margin-bottom: 32px; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.tool-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.2s;
  position: relative;
  display: block; color: var(--text);
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(124,58,237,0.1);
  color: var(--text);
}
.tool-icon {
  font-size: 28px; font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}
.tool-card h3 { font-size: 16px; margin-bottom: 8px; }
.tool-card p { font-size: 13px; color: var(--text2); line-height: 1.5; }
.tool-tag {
  position: absolute; top: 12px; right: 12px;
  background: var(--accent-glow); color: var(--purple);
  font-size: 11px; font-weight: 600; padding: 2px 8px;
  border-radius: 4px; text-transform: uppercase;
}
.tool-tag.gold {
  background: rgba(251,191,36,0.15); color: var(--gold);
}
.tool-tag.blue {
  background: rgba(56,189,248,0.15); color: var(--blue);
}
.tool-tag.pink {
  background: rgba(244,114,182,0.15); color: var(--pink);
}

/* Category label */
.category-label {
  font-size: 13px; font-weight: 600; color: var(--text3);
  text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* About */
.about-section { padding: 60px 0; border-top: 1px solid var(--border); }
.about-section h2 { font-size: 28px; margin-bottom: 32px; text-align: center; }
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}
.feature {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.feature h3 { font-size: 16px; margin-bottom: 8px; }
.feature p { font-size: 13px; color: var(--text2); }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text3);
  font-size: 13px;
}

/* ===== Tool Page Styles ===== */

.tool-page {
  padding: 32px 0 80px;
}
.tool-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 24px; flex-wrap: wrap;
}
.tool-header h1 { font-size: 28px; font-weight: 700; }
.tool-header .back-link {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--text3); font-size: 14px;
}
.tool-header .back-link:hover { color: var(--accent); }
.privacy-note {
  display: flex; align-items: center; gap: 6px;
  color: var(--purple); font-size: 13px;
  margin-left: auto;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 768px) {
  .calc-layout { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
}

/* Input Panel */
.calc-input-panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.input-group {
  margin-bottom: 20px;
}
.input-group:last-child {
  margin-bottom: 0;
}
.input-group label {
  display: block; font-size: 13px; font-weight: 500;
  color: var(--text2); margin-bottom: 6px;
}
.input-row {
  display: flex; align-items: center; gap: 8px;
}
.input-prefix, .input-suffix {
  font-size: 14px; color: var(--text2); font-weight: 500;
  white-space: nowrap;
}
.input-field {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 16px;
  font-weight: 500;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s;
}
.input-field:focus {
  border-color: var(--accent);
}
.input-field::placeholder {
  color: var(--text3);
  font-weight: 400;
}

textarea.input-field {
  min-height: 120px;
  resize: vertical;
  font-family: inherit;
  line-height: 1.6;
}

select.input-field {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%236a6a80'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.range-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--bg3);
  outline: none;
  margin-top: 8px;
}
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg2);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}
.range-slider::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg2);
}

.btn-generate {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent), #38bdf8);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 20px;
}
.btn-generate:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-calculate {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 20px;
}
.btn-calculate:hover { background: var(--accent2); }

.btn-group {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0;
}
.btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg2);
  color: var(--text);
  font-size: 13px; font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.active { border-color: var(--accent); background: var(--accent-glow); color: var(--purple); }

/* Results Panel */
.calc-results-panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.result-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.result-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}
.result-item.highlight {
  border-color: var(--accent);
  background: rgba(124,58,237,0.05);
}
.result-label {
  font-size: 12px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.result-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--purple);
}
.result-value.small {
  font-size: 18px;
}

/* Output area */
.output-area {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  min-height: 120px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
  word-wrap: break-word;
  position: relative;
}
.output-area.empty {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
  font-size: 14px;
}
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text2);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Tool About */
.tool-about {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.tool-about h2 {
  font-size: 22px; margin-bottom: 16px;
}
.tool-about h3 {
  font-size: 16px; margin: 20px 0 8px; color: var(--purple);
}
.tool-about p {
  font-size: 14px; color: var(--text2); line-height: 1.7;
  margin-bottom: 12px;
}
.tool-about ul {
  padding-left: 20px; color: var(--text2);
  font-size: 14px; line-height: 1.8;
}

/* FAQ */
.faq-section {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.faq-item {
  margin-bottom: 16px;
  padding: 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.faq-item:hover { border-color: var(--accent); }
.faq-question {
  font-size: 15px; font-weight: 600; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.faq-arrow {
  transition: transform 0.2s;
  color: var(--text3);
  font-size: 12px;
}
.faq-item.open .faq-arrow { transform: rotate(90deg); }
.faq-answer {
  display: none;
  margin-top: 12px;
  font-size: 14px;
  color: var(--text2);
  line-height: 1.7;
  padding-left: 20px;
}
.faq-item.open .faq-answer { display: block; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text3);
}
.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}
.empty-state p {
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero { padding: 60px 16px 40px; }
  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .tools-grid { grid-template-columns: 1fr; }
  .result-summary { grid-template-columns: 1fr; }
  .input-row { flex-wrap: wrap; }
}

/* Print */
@media print {
  .header, .footer, .calc-input-panel, .btn-generate, .btn-calculate { display: none; }
  body { background: #fff; color: #000; }
  .calc-results-panel { border: 1px solid #ccc; }
}